Electrical condenser



Jan. 7, 1930 I UN; 1,742,468

ELECTRICAL CONDENSER Filed Jan- 15, 1929 INVENTOR PRESTON -E. GILL/N6 15 they might not tune theirrespective circuits Patented Jan. 7, 1930 UNITED- STATES:

PATENT OFFICE ran-error; E. Gimme, or mnnon azaars, new JERSEY, ASSIGNOR T mm con- DENSEB company, cream mu, new masny nnncrmcnr. conminsna 's ncatiofimea January 15, 1929. Serial No. $32,696.

This invention relates to improvementsin a variable v condenser which is especially adapted for use in connection with radio re:

ceivihg sets. 1

In such sets it has become 1 associated, it is impossible, due to mechanical inaccuracies. in manufacture, to have each condenser exactly alike, and besides, the cir- 1 cuits in which the condensers are used, vary in electrical characteristics, so that if the condensers were exactly alike outside of the set,

to the maximum point on the resonance curve when installed in the set, Certain types of compensating devices have been sug ested for use in connection with a. gang con enser whereby each condenser unit may be adjusted so as to get maximum efliciency in-its circuit. It is the object of my invention to provide an\ electrically compensating device for the purpose of securin a aximum tuning eflect of each ofjthe coi enge'rs of. the gang. Another object of my in ention is to provide a predetermined minimum capacity of the condenser. While attaining the principal object of iny inventiomanother object is to provide an arrangement which is simple and cheap to manufacture and easy to assemble and adjllSl]. J i I My invention will'be best understood by reference to the annexed drawing, wherein:

Figure 1 is a plan View oi one type of condenser to which I have applied my invention; Figure 2 is a sectional iew on the line 2'-2 of Figure 1. I,

Figure 3 is a View of a similar section of a modified form of compensating device.

In the drawing, 1 and 2 are end plates preferable of metal, having lugs 3 turn ed inward ly for the purpose of supporting insulating bars 4 and 5 which are fastened to the lugs 3 customary to use a plurality of condensers mounted on the by means of screws 6. The end plates 1 and 2 carry a rotor'shaft 7 on which are mounted two groups of rotor plates 8 and 9, the outer peripheries of which are fastened together by tieplates 10. The stator plates of each unit are mounted on tie bars 11 which are fastened to the insulating bars 4 and 5 in any satisfactory manner as by screws 12.

' While two condenser units are shown mounted in tandem, it is to be understood that any desired number of units may he so mounted and therotors operated by the shaft 7.

The present form of compensating device which is mounted between the two groups of stator plates, comprises two arcuately formed metal pieces 13 and 14. The member 13 is "*fastened to the two tie bars 11 of condenser 15 irrany satisfactory manner as by soldered o1nts 17. The member 14; is fastened to the opposite t1e bars of the condenser 16 in a similar manner. a

In the space between the members 13 and 14, is a metallic member 18 which is carried between the insulating'bars 5 and 6 by means of screws 19. The member 18 is connected to the rotor shaft 7 by means of a flexible conductor 20, as is further shown in Figure 1. The holes 21 in the bars 5 and-6 for the the screws 191, are preferably made somewhat larger than the threaded part ofthe screws 19, so that when one or both of the screws 19 are loosened, the memberlScan e moved laterally toward or' away from eit er of the members 13.and 14, thereby changing the capacity relation between these members. It will be observed that the members 13, 14:, and 18 comprise a very small air condenser, and by shifting therelation of these parts, the capacity of the condensers 15 and 16 may be slightly altered.

If desired, the screw holes in the member 18 may be slightly off-center, as indicated by the dotted line 22, so that the member 18 may be rotated slightly as well as moved laterally here 13 and 14.

' ween the stator supports and connected one In Figure 3, the member 18 may be a double-pear shape, or any other shape desired, so that the capacity relationship may be varied at' different angular positions of the in Figure 2, if desired.

This arrangement provides a very simple and inexpensive compensating device for the purpose described, and while the type of condenser to which my improvement isapplied is like that described in my application'Serial No. 331,144, filed January 8, 1929, it is to be understood of course that the shape of the stator and rotary plates, and their method of mounting in the frame, may be varied over wide limits, without affecting the nature of my improvement,

Having thus described my invention, what I claim is: V

1. In combination with a plurality of mam radio tuning condensers mounted within the same frame-work and having a single control member 18 which may be moved laterally as for the rotors of said condensers, a compen satin-g condenser'posltioned between two of the main condensers and extending parallel to the plane of the stator plates thereof, said compensating condenser comprising; two arcuately formed members extending bee'achto adjacent stator groups, and a middle member carried between said two a'rcuately- I formed members and electrically connected to the rotor system.

2. In combination with a plurality of main radio tuning condensers mounted within the same frame-work and having a single control for therotors of said condensers, a compensating condenser positioned between two ofthe main condensers and extending parallel to the plane of the stator plates thereof,

said compensating condenser comprising; two arcuately formed members extending between the stator supports and connected one each to adjacent stator groups, a middle member carried between said two arcuatelyformed members and electrically connected to the rotor system, and means for adjusting said middle member with respect to said two members.

3. In combination with a plurality of main radio tuning condensers mounted within. the same frame-work and having a single control for the rotors of said condensers, a compeneating condenser positioned between two of the mam condensers and extending parallel to the plane of the stator plates thereof, said compensating condenser comprising; two areuately formed metallic members electrically connected one each to opposite sides Oi adja cent stators, and a middle metallic member adjustably supported at both ends between said two arcuately-formedmembers and electrically'connected to the rotor system,

4, In combination witha plurality of main radio tuning condensers mounted within the sating condenser positioned between two of. I

th'e 'main. condensers and extending parallel to the plane of the stator plates thereof, said compensatingcondenser comprising; two arcuately formed metallic members electrically connected one each to opposite side'sof adjacent stators,'and a middle metallic member supported at both ends between said two arcuately-formed members and electrically ,trol for the rotors of said condensers, a com-- pensating condenser positioned between two of the main condensers and extending par- 'allel to. the plane of thestator'plates thereof.

said compensating condenser comprising;

two arcuately formed metallicmembers electrically connected one each to opposite sides of adjacent stators. and a middle metallic member supported at both ends between said two arcuately-formed members and electrically connected to the rotorsystem, said denser-s consisting of a small auxiliary condenser mounted between two of the frame members and extending the full width of the stator groups and between two of said groups;

said auxiliary condenser comprising three parts: two arcuately-formed members electrically connected one each to adjacent stators. and a middle adjustable part electrically connected to the rotor system.

7 In agang tuning condenser having metallic end supports fastened together by suitable frame members, a plurality of stator groups comprising parts of main condensers carried by said frame members but insulated from each other, movable plates carried between said end support members for cooperation with said stationary plates, means for slightly altering the capacity of the main condensers consisting of a small auxiliary condenser mounted between two of the frame members and extending the full width of the stator groups and between two of said groups,

no I

carry Jthe stators, said 'midiiie 1 said condenser mmprising metallic parts; .two amua'tdy-tformed and electrical! sonnected one each at ends to agjacent stators and a 11116' a part carried between'ihemmsiramemembers'fihlt. it being 7 fQrmeiand maunted so is 156 be either retitably and/r laterally moved to alter theciptci tv'of themninnondensutsm side of the auxiliary co udgnser. I 1 In testlmony whereeLflI :afiix my signature.

' I v PRESTDN E. 

